Acrylic resin film

Abstract

Disclosed herein is an acrylic resin film having excellent heat resistance and mechanical strength, less fish-eyes, and high transparency. The acrylic resin film is obtained by molding a resin composition containing a glutarimide acrylic resin (G) and a (meth)acrylic resin (F) obtained by polymerization of a vinyl group-containing compound in the presence of alkyl acrylate-based cross-linked elastic particles having an average particle size of less than 80 nm.

The invention claimed is: 
     
       1. An acrylic resin film obtained by molding a resin composition containing the following components (G) and (F):
 a glutarimide acrylic resin (G) that contains a unit represented by the following general formula (1) and a unit represented by the following general formula (2) and has a glass transition temperature of 120° C. or higher, 
 
       
         
           
           
               
               
           
         
         (wherein R 1  and R 2  are each independently hydrogen or an alkyl group having 1 to 8 carbon atoms and R 3  is hydrogen, an alkyl group having 1 to 18 carbon atoms, a cycloalkyl group having 3 to 12 carbon atoms, or a substituent group having an aromatic ring and 5 to 15 carbon atoms) 
       
       
         
           
           
               
               
           
         
         (wherein R 4  and R 5  are each independently hydrogen or an alkyl group having 1 to 8 carbon atoms and R 6  is an alkyl group having 1 to 18 carbon atoms, a cycloalkyl group having 3 to 12 carbon atoms, or a substituent group having an aromatic ring and 5 to 15 carbon atoms); and 
         a (meth)acrylic resin (F) obtained by polymerization of a vinyl group-containing compound in the presence of alkyl acrylate-based cross-linked elastic particles having an average particle size of 40 nm or more and less than 80 nm and obtained by copolymerization of alkyl acrylate and another vinyl monomer copolymerizable therewith; 
         wherein the glutarimide acrylic resin (G) does not contain a unit represented by the following general formual (3): 
       
       
         
           
           
               
               
           
         
         (wherein R 7  is hydrogen or an alkyl group having 1 to 8 carbon atoms and R 8  is an aryl group having 6 to 10 carbon atoms); and 
         wherein said vinyl group-containing compound in the (meth) acrylic resin (F) is a monomer mixture (E) consisting of 60 to 100 wt % of alkyl methacrylate and 0 to 40 wt % of alkyl acrylate, or a monomer mixture (E) consisting of more than 10 wt % but 35 wt % or less of unsaturated carboxylic acid, 50 wt % or more but less than 90 wt % of alkyl methacrylate and 0 wt % or more but less than 40 wt % of alkyl acrylate. 
       
     
     
       2. The acrylic resin film according to  claim 1 , wherein, when an amount of the resin composition is taken as 100 wt %, an amount of the alkyl acrylate-based cross-linked elastic particles contained in the resin composition is 5 to 40 wt %. 
     
     
       3. The acrylic resin film according to  claim 1 , wherein, when an amount of the resin composition is taken as 100 wt %, amounts of the glutarimide acrylic resin (G) and the (meth)acrylic resin (F) contained in the resin composition are 40 to 90 wt % and 60 to 10 wt %, respectively. 
     
     
       4. The acrylic resin film according to  claim 1 , wherein the (meth)acrylic resin (F) is obtained by polymerization of a monomer mixture (E) consisting of 60 to 100 wt % of alkyl methacrylate and 0 to 40 wt % of alkyl acrylate in the presence of alkyl acrylate-based cross-linked elastic particles (B) having an average particle size of less than 80 nm and obtained by copolymerization of 100 parts by weight of a monomer mixture consisting of 50 to 100 wt % of alkyl acrylate and 50 to 0 wt % of alkyl methacrylate and 0.5 to 5 parts by weight of a polyfunctional monomer having two or more non-conjugated double bonds per molecule. 
     
     
       5. The acrylic resin film according to  claim 1 , wherein the (meth)acrylic resin (F) is obtained by polymerization of a monomer mixture (E) consisting of more than 10 wt % but 35 wt % or less of unsaturated carboxylic acid, 50 wt % or more but less than 90 wt % of alkyl methacrylate and 0 wt % or more but less than 40 wt % of alkyl acrylate in the presence of alkyl acrylate-based cross-linked elastic particles (B) having an average particle size of less than 80 nm and obtained by copolymerization of 100 parts by weight of a monomer mixture consisting of 50 to 100 wt % of alkyl acrylate and 50 to 0 wt % of alkyl methacrylate and 0.5 to 5 parts by weight of a polyfunctional monomer having two or more non-conjugated double bonds per molecule, and
 wherein an amount of the alkyl acrylate-based cross-linked elastic particles (B) contained in the (meth)acrylic resin (F) is more than 30 wt % but 60 wt % or less. 
 
     
     
       6. The acrylic resin film according to  claim 1 , which has a glass transition temperature of 115° C. or higher, a haze value of 1.0% or less, and a thickness of 300 μm or less. 
     
     
       7. An optical film comprising the acrylic resin film according to  claim 1 .